Senior administration officials tell ABC News that information from this recent Christmas Day threat has prompted the intelligence community to go back and look at the approximately 550,000 names in the Terrorist Identities Datamart Environment (TIDE), and the roughly 400,000 names in the Terrorist Screening Data Base (TSDB) and –“based on age and nationality criteria” extrapolated from the recent plot – identify dozens of people from those two lists and add them to the “Selectee List.”‬

The Selectee List is approximately 16,000 individuals who require more stringent screening before they are permitted to board an airplane.‬‪

Also some people — "and their numbers were relatively small" — were added to the No-fly list, an official says.